Particle Physics

Displaying 337 - 348 of 488

Minimal Distances and the RG Flow
October 29, 2013

PIRSA:13100069
Particle Physics
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Richard Hill University of Kentucky
October 18, 2013

PIRSA:13100107
Particle Physics
Including astroparticle observables in global fits to new physics scenarios

Patrick Scott McGill University
October 15, 2013

PIRSA:13100103
Particle Physics
Electroweak Cogenesis and a CP Violating Higgs Boson
September 24, 2013

PIRSA:13090077
Particle Physics
The local Callan-Symanzik equation: structure and applications

Boaz Keren-Zur L'Ecole Polytechnique Federale de Lausanne (EPFL)
September 06, 2013

PIRSA:13090067
Particle Physics
Bottom-up Naturalness

Sonia El Hedri Stanford University
August 27, 2013

PIRSA:13080056
Particle Physics
The Dark Side of Matter

Itay Yavin McMaster University

July 17, 2013

PIRSA:13070032
Soft and Coulomb resummation: squark and gluino production at the LHC
July 09, 2013

PIRSA:13070034
Particle Physics
From topological insulator to weak scale flavor physics

Sichun Sun University of Washington
April 30, 2013

PIRSA:13040126
Particle Physics
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute for Theoretical Physics
April 02, 2013

PIRSA:13040115
Particle Physics
Effective field theory of the unstable top (quark)

Alexander Penin University of Alberta
March 26, 2013

PIRSA:13030090
Particle Physics
Learning what the Higgs is mixed with

Kunal Kumar Carleton University
March 19, 2013

PIRSA:13030089
Particle Physics

Minimal Distances and the RG Flow
October 29, 2013

PIRSA:13100069
Particle Physics
We will discuss the renormalization group flow between different classes of CFTs in four dimensions and study possible lower bounds on the "distances" between these theories.
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Richard Hill University of Kentucky
October 18, 2013

PIRSA:13100107
Particle Physics
Heavy particle expansions, familiar from heavy quark physics, have found important applications in the analysis of dark matter candidates and their interactions with the Standard Model. From a different direction, precision spectroscopy of muonic hydrogen has challenged QED and required more precise knowledge of proton structure. These problems have forced a closer examination of the construction of general heavy particle lagrangians at high orders in the 1/M expansion, and in the absence of known ultraviolet completions. Key aspects of this formalism, including the emergence of Lorentz invariance from "nonrelativistic" lagrangians, are reviewed, and several applications are presented. A status report on the proton radius puzzle is given.
Including astroparticle observables in global fits to new physics scenarios

Patrick Scott McGill University
October 15, 2013

PIRSA:13100103
Particle Physics
Searches for physics beyond the standard model come in many forms, from terrestrial probes to astroparticle experiments and cosmological observations. Efforts to combine multiple search channels in 'global fits' to new physics scenarios typically consider only a subset of the available channels. Astroparticle searches in particular are usually only included in a very approximate way, if at all. In this talk I will review recent progress in including detailed gamma-ray, neutrino and CMB searches for dark matter in global fits. I will also preview some of the future developments and challenges in this field, where the applicability of global fits will move well beyond the small range of constrained supersymmetric models they have so far mostly been applied to.
Electroweak Cogenesis and a CP Violating Higgs Boson
September 24, 2013

PIRSA:13090077
Particle Physics
We propose a simple renormalizable model of baryogenesis and asymmetric dark matter generation at the electroweak phase transition. Our setup utilizes the two Higgs doublet model plus two complex gauge singlets, the lighter of which is stable dark matter. The dark matter is charged under a global symmetry that is broken in the early universe but restored during the electroweak phase transition. Because the ratio of baryon and dark matter asymmetries is controlled by model parameters, the dark matter need not be light. Thus, new force carriers are unnecessary and the symmetric dark matter abundance can be eliminated via Higgs portal interactions alone. The dark matter mass is also constrained within a window around the weak scale. One of the main predictions of this model is CP violating Higgs signals at the LHC and future colliders.
The local Callan-Symanzik equation: structure and applications

Boaz Keren-Zur L'Ecole Polytechnique Federale de Lausanne (EPFL)
September 06, 2013

PIRSA:13090067
Particle Physics
The local Callan-Symanzik equation describes the response of a quantum field theory to local scale transformations in the presence of background sources. The consistency conditions associated with this anomalous equation can be used to derive powerful constraints on RG flows. We will discuss various aspects of the equation and present new results regarding the structure of the anomaly. We then use the equation to write correlation functions of the trace of the energy-momentum tensor off-criticality.
Bottom-up Naturalness

Sonia El Hedri Stanford University
August 27, 2013

PIRSA:13080056
Particle Physics
We study the naturalness problem using a model independent bottom up approach by considering models where only the interaction terms needed to cancel the Higgs quadratic divergences are present. If quadratic divergences are canceled by terms linear in the Higgs field, then the collider phenomenology is well covered by current electroweakino and fourth generation searches. If quadratic divergences are canceled by terms bilinear in the Higgs field, then the signatures are highly dependent on the quantum numbers of the new particles. Precision Higgs measurements can reveal the presence of new particles with either vevs or Standard Model charges. If the new particles are scalar dark matter candidates, their direct and indirect detection signatures will be highly correlated and within the reach of XENON100 and Fermi. Observation at one of these experiments would imply observation at the other one. Observable LHC decay channels can also arise if the new particles mix with lighter states. This decay channel involves only the Higgs boson and not the gauge bosons. Observation of such decays would give evidence that the new particle is tied to the naturalness problem.
The Dark Side of Matter

Itay Yavin McMaster University

July 17, 2013

PIRSA:13070032
Soft and Coulomb resummation: squark and gluino production at the LHC
July 09, 2013

PIRSA:13070034
Particle Physics
We consider the production of strongly interacting, heavy SUSY pairs at the LHC. When the centre of mass energy is close to the production threshold of the pair, the corresponding cross sections receive large higher-loop QCD corrections. These corrections are classified as the so-called soft logarithms and Coulomb singularities and they lead to a break down of the usual perturbation expansion. In this talk I review the origin of these large corrections and explain how they can be resummed by using Effective Field theories. Finally, I will present some resummed results for the pair production cross sections of heavy squarks and gluinos. Based on: arXiv:1202.2260 and 1211.3408.
From topological insulator to weak scale flavor physics

Sichun Sun University of Washington
April 30, 2013

PIRSA:13040126
Particle Physics
In this talk, I will start with briefly introducing some universal physics behind quantum hall and topological insulator , which inspired a BSM flavor model. It intimately relates deconstructed little Higgs to flavor structure: fermion masses, CKM etc. This new cousin of little Higgs, we call it little flavor, shares a 10-20 Tev cut-off scale with little Higgs, so as to explain flavor structure at surprisingly low scale without rising FCNC problem.
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute for Theoretical Physics
April 02, 2013

PIRSA:13040115
Particle Physics
Physics is at a crossroad that leads either to Naturalness or the Multiverse. While the confirmation of gauge coupling unification in the early 90s gave a tremendous boost to naturalness and to low energy SUSY, the lack of evidence for new physics beyond the standard model at the LHC points to a paucity of new particles near the weak scale. This suggests that the weak scale is tuned and that supersymmetry, if present at all, is realized at higher energies. This points to Split SUSY, a framework motivated by the String Landscape. Fine-tuning electroweak symmetry breaking and the renormalization group evolution of the scalar masses constrains Split model building and I review the expectations at the LHC for the different possible Split SUSY particle spectra.
Effective field theory of the unstable top (quark)

Alexander Penin University of Alberta
March 26, 2013

PIRSA:13030090
Particle Physics
I introduce a new nonrelativistic effective field theory which systematically accounts for the finite lifetime effects in production of unstable particles.
The theory is applied to the threshold production of top quark-antiquark pairs.
Learning what the Higgs is mixed with

Kunal Kumar Carleton University
March 19, 2013

PIRSA:13030089
Particle Physics
The Standard Model Higgs boson may be mixed with another scalar that does not couple singly to gauge bosons or fermions. The electroweak quantum numbers of such an additional scalar can be determined by measuring the quartic Higgs-Higgs-vector-vector couplings, which contribute—along with the coveted triple Higgs coupling—to double Higgs production in e+e− collisions. We show that simultaneous sensitivity to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling can be obtained using measurements of the double Higgs production cross section at two different e+e− center-of-mass energies. Kinematic distributions of the two Higgs bosons in the final state could provide additional discriminating power.

Title	Speaker(s)	Date	Talk Type	Info
Minimal Distances and the RG Flow		2013-10-29	Scientific Series	View details
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle	Richard Hill	2013-10-18	Scientific Series	View details
Including astroparticle observables in global fits to new physics scenarios	Patrick Scott	2013-10-15	Scientific Series	View details
Electroweak Cogenesis and a CP Violating Higgs Boson		2013-09-24	Scientific Series	View details
The local Callan-Symanzik equation: structure and applications	Boaz Keren-Zur	2013-09-06	Scientific Series	View details
Bottom-up Naturalness	Sonia El Hedri	2013-08-27	Scientific Series	View details
The Dark Side of Matter	Itay Yavin	2013-07-17		View details
Soft and Coulomb resummation: squark and gluino production at the LHC		2013-07-09	Scientific Series	View details
From topological insulator to weak scale flavor physics	Sichun Sun	2013-04-30	Scientific Series	View details
To Split or Not to Split	Asimina Arvanitaki	2013-04-02	Scientific Series	View details
Effective field theory of the unstable top (quark)	Alexander Penin	2013-03-26	Scientific Series	View details
Learning what the Higgs is mixed with	Kunal Kumar	2013-03-19	Scientific Series	View details

Particle Physics

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